A switch matrix driving circuit and method

Abstract

The invention discloses a switch matrix drive circuit and method, a CPLD chip used to receive instructions sent by a bus interface and decode the received instructions; a relay drive chip connected to the CPLD chip through a line and used to receive the CPLD The instructions decoded by the chip are selected to output valid bits through address data SEL decoding to control the corresponding relay action; wherein, the relay driver chips are M groups, any group includes N driver chips, and the driver chips of the same group share one For chip selection CS, the nth chips in different groups share a switch level signal LVL, and all drive chips share an address data SEL, where n≤N. The beneficial effects of the present invention are: by rationally designing the drive circuit and sharing the control signals in groups, the misoperation problem caused by the sharing of the control signals is effectively solved; the design integration degree of the switch matrix is ​​improved, and the miniaturization design requirement of the automatic test equipment is met.

Description

technical field [0001] The invention relates to the field of switch matrix control, in particular to a switch matrix driving circuit and method. Background technique [0002] Currently, existing switch matrix control methods such as figure 1 As shown, the driver chip has no data selection function, so the number of SEL signals can only drive the same number of relays, and it is difficult to effectively simplify the driving circuit. The control signal of the driver chip corresponds to the driver chip one by one and cannot be shared. For each additional driver chip, the corresponding chip selection and switch level control signals need to be added. The main control chip needs to allocate many more pins to control these driver chips. [0003] The traditional large-scale switch matrix, due to the variety and complexity of relays and control circuits, is difficult to realize the miniaturization of the device, takes up a lot of space resources, and is not conducive to the constru...

AI Technical Summary

Problems solved by technology

[0003] Traditional large-scale switch matrix, due to the variety and complexity of relays and control circuits, it is difficult to realize the miniaturization of the device, occupying a lot of space resources, which is not conducive to the construction of automatic test systems

[0004] In the traditional switch matrix device, the control line is directly connected to the relay array after being boosted and expanded by the driver. In order to achieve precise control of the switch channel, all control signals of the drive circuit need to be controlled by a separate control signal line, which takes up a lot of space. Board-level resources make the expandable space of the switch matrix very small, and it is difficult to adapt to the test requirements of rapid development

[0005] The traditional switch matrix control method cannot reasonably share the control signals of the driver chip, and the sharing of control signals will cause a large number of relay misoperations, which cannot realize precise control of signal transmission and routing, and cannot guarantee the switching and routing of signal input and output in the test system

[0006] In the traditional switch matrix control method, when it is necessary to maintain the control signal state of a relay, the control signal state of the corresponding driver chip must be maintained. During long-term operation, the power loss caused is very large, and it is not conducive to the heat dissipation of the device.

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